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dsnegi_25dec - i did open the third link; exchange 2010 SP3 which supports windows 2012; NOT 2012 R2

afacts - it will be a regular installation with the service pack. they have done the same thing with exchange 2010. you don't need to install RTM then apply the latest service pack; the service pack is the full product now with the latest components before any rollups. 2013 SP1 isn't released yet but have read 2012 R2 is supported with it. haven't done a migration to it from 2007 but this article discusses what is required; might possibly change with the SP1 release